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STOCK-BASED COMPENSATION (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Integer
$ / shares
shares
Jun. 30, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense | $     $ (4,275,000)  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Executive Officer [Member]        
Weighted Average Grant Date Fair Value [Abstract]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum)     0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum)     59,477  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Company Performance Awards [Member] | Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of shares issued (in dollars per share) | $ / shares     $ 74.80  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)     36,571  
Weighted Average Grant Date Fair Value [Abstract]        
Granted (per share) | $ / shares     $ 74.80  
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date     20.00%  
Percentage of shares granted vesting annually in future periods 20.00%   20.00%  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of shares issued (in dollars per share) | $ / shares     $ 74.80  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)     33,289  
Weighted Average Grant Date Fair Value [Abstract]        
Granted (per share) | $ / shares     $ 74.80  
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date     25.00%  
Percentage of shares granted vesting annually in future periods 25.00%   25.00%  
Equity Instruments other than options, number of plans | Integer     3  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Service Condition Only Awards [Member] | Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of shares issued (in dollars per share) | $ / shares     $ 78.18  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)     5,406  
Weighted Average Grant Date Fair Value [Abstract]        
Granted (per share) | $ / shares     $ 78.18  
Equity Instruments other than options, number of plans | Integer     1  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     25.00%  
Award Recipient Type Employee [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation costs capitalized as development costs | $ $ 383,000 $ 250,000 $ 869,000 $ 607,000
Allocated Share-based Compensation Expense | $ $ 952,000 651,000 $ 3,633,000 3,665,000
Shares withheld for tax obligations     33,695  
Fair value of shares vested as of the vesting date | $     $ 6,441,000  
Award Recipient Type Employee [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of shares issued (in dollars per share) | $ / shares     $ 81.27  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)     5,169  
Weighted Average Grant Date Fair Value [Abstract]        
Granted (per share) | $ / shares     $ 81.27  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     20.00%  
Award Recipient Type Employee [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Non Executive Officers [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of shares issued (in dollars per share) | $ / shares     $ 84.57  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares)     12,850  
Weighted Average Grant Date Fair Value [Abstract]        
Granted (per share) | $ / shares     $ 84.57  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     20.00%  
Award Recipient Type Employee [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Company Performance Awards [Member] | Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of shares issued (in dollars per share) | $ / shares     $ 78.18  
Weighted Average Grant Date Fair Value [Abstract]        
Granted (per share) | $ / shares     $ 78.18  
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date     20.00%  
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights     20.00%  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum)     0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum)     21,096  
Award Recipient Type Employee [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Individual performance awards [Member] | Executive Officer [Member]        
Weighted Average Grant Date Fair Value [Abstract]        
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date     20.00%  
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights     20.00%  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum)     0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum)     5,274  
Award Recipient Type Employees and Directors [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of shares issued (in dollars per share) | $ / shares [1] $ 82.37   $ 76.70  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Unvested at beginning of period (in shares) 129,323   162,191  
Granted (in shares) [1] 23,425   93,285  
Forfeited (in shares) 0   (16,000)  
Vested (in shares) 0   (86,728)  
Unvested at end of period (in shares) 152,748   152,748  
Weighted Average Grant Date Fair Value [Abstract]        
Unvested at beginning of period (per share) | $ / shares $ 59.70   $ 51.98  
Granted (per share) | $ / shares [1] 82.37   76.70  
Forfeited (per share) | $ / shares 0.00   36.98  
Vested (per share) | $ / shares 0.00   61.62  
Unvested at end of period (per share) | $ / shares $ 63.18   $ 63.18  
Award Recipient Type Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense | $ $ 161,000 $ 133,000 $ 323,000 $ 266,000
One year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member]        
Weighted Average Grant Date Fair Value [Abstract]        
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date     100.00%  
Number of years in total shareholder return performance period | Integer     1  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum)     0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum)     4,730  
Two year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member]        
Weighted Average Grant Date Fair Value [Abstract]        
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date     100.00%  
Number of years in total shareholder return performance period | Integer     2  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum)     0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum)     9,460  
Three year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member]        
Weighted Average Grant Date Fair Value [Abstract]        
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date     75.00%  
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights     25.00%  
Number of years in total shareholder return performance period | Integer     3  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum)     0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum)     18,917  
[1] Does not include the restricted shares that may be earned if the performance goals established in 2017 for annual and long-term performance periods are achieved. Depending on the actual level of achievement of the goals at the end of the open performance periods, the number of shares earned could range from zero to 59,477.